Therm-X MVHRU HR95
Technical Manual
Page 5 of 59
Version 2.4, 25/09/2020
2.5.
FILTERS
Filtration for protection of the
finned heat exchanger and
treatment of the supply air is
provided
by
compact,
cardboard mounted, synthetic
media filters.
Grade of filtration according to BS EN779:2012 /
ISO16890 is class
G4 / ePM
Coarse
60% plus F7 /
ePM
10
50%
on supply and G4 / ePM
Coarse
60% on
extract.
The low pressure drop synthetic media makes for a
low energy consumption filter, to help reduce the
overall energy consumption of the unit.
The filters are mounted on
slides
for easy removal
and
tightly sealed against the slide rails
to ensure
reduced filter bypass leakage.
2.6.
COUNTER FLOW PLATE HEAT
EXCHANGER
The heat recovery section is equipped with a highly
efficient
counter-flow air to air heat exchanger
,
exceeding the 2018 requirements of regulation
1253/2014 of the Eco-design directive for ventilation
units, with
operational efficiency up to 93%.
The heat exchanger finned block
and casing are manufactured
from
high
thermal
transmittance and corrosion
resistant aluminium
.
The exchanger is Eurovent certified and fully
tested to EN308:1997.
The heat recovery section is also provided with
fully
modulating face and by-pass damper
to provide
close control of the supply air temperature and
enable
free cooling operation
when the conditions
are favourable (e.g. summer night ventilation).
In extreme conditions when the exhaust temperature
drops below the frost risk limit the unit controls
strategy provides
frost protection
for the heat
exchanger by bypassing some of the cold air.
Where it’s not desirable to impact the unit operation
during the frost protection strategy, an
electric pre-
heating coil (frost coil)
can be offered to provide
improved frost protection.
A fully removable,
epoxy coated, galvanized steel
condensate tray
fitted with an
thermally insulated
condensate trap
(located on the base frame of the
unit) and a 40mm OD drain
connection is provided for
condensate collection and
disposal.
The condensate tray is
equipped with a
water level sensor
to
avoid
overflow of the tray by stopping operation.
2.7.
OPTIONAL FEATURES
2.7.1.
INTEGRAL ELECTRICAL PRE/POST-
HEATING COIL
The unit can
optionally be fitted with an electrical
pre-heater
and/or post-heater
manufactured with
open coil heating elements and galvanized casing.
The heater is complete with fully modulating
SCR
(Silicon Controlled Rectifier) control (0-10V)
and
2 stages of overheat protection
(automatic and
manual reset) all integral to
the unit’s
control strategy.
The SCR control provides accurate, supply air
temperature modulation.
The heat output is precisely controlled from 0 to 100%
to a user defined setpoint by using the
unit in-built
temperature sensors
or a
room temperature
sensor
(supplied with every unit, installation and
wiring on site by others).
The electric pre-heating coil is recommended where
sub-zero temperatures are expected.
The electrical post-heating coil is recommended
where no hot water supply is available on site and
there is need for top-up heating of the supply air.